cmake: Upgrade intx to v0.12.0

[chfast]

This version has _u384 literal suffix
and using namespace intx::literals as an alternative to using namespace intx.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.08%. Comparing base (ec2fa02) to head (610dff3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@ ## master #985 +/- ## ======================================= Coverage 94.08% 94.08% ======================================= Files 144 144 Lines 16202 16203 +1 ======================================= + Hits 15244 15245 +1  Misses 958 958 

Flag	Coverage Δ
eof_execution_spec_tests	16.65% <0.00%> (-0.01%)	⬇️
ethereum_tests	26.56% <25.00%> (+<0.01%)	⬆️
ethereum_tests_silkpre	18.62% <25.00%> (ø)
execution_spec_tests	17.72% <25.00%> (+<0.01%)	⬆️
unittests	89.54% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
lib/evmone_precompiles/ecc.hpp	100.00% <100.00%> (ø)
test/unittests/evm_eip7516_blobbasefee_test.cpp	100.00% <ø> (ø)
test/unittests/evmmax_bn254_add_test.cpp	100.00% <ø> (ø)
test/unittests/evmmax_bn254_mul_test.cpp	100.00% <ø> (ø)
test/unittests/evmmax_test.cpp	96.55% <ø> (ø)
test/unittests/state_block_test.cpp	100.00% <ø> (ø)
test/unittests/state_mpt_hash_test.cpp	99.11% <ø> (ø)
test/unittests/state_mpt_test.cpp	100.00% <ø> (ø)
test/unittests/statetest_loader_tx_test.cpp	100.00% <ø> (ø)
test/unittests/tracing_test.cpp	100.00% <100.00%> (ø)